#183D75#183D75

#183D75 is a dark, moderate blue. Relative luminance 0.048; OKLCH L 36.6% C 0.105 H 258.7°. Best body text is #FFFFFF at 10.70:1 contrast (WCAG AA passes).

Color values

HEX	#183D75
RGB	rgb(24, 61, 117)
HSL	hsl(216, 66%, 28%)
HSV	hsv(216, 79%, 46%)
CMYK	cmyk(79.5%, 47.9%, 0%, 54.1%)
CIE-LAB	lab(26.20, 8.57, -35.93)
CIE-LCH	lch(26.20, 36.94, 283.42°)
OKLab	oklab(36.64% -0.0205 -0.1031)
OKLCH	oklch(36.64% 0.105 258.7)
XYZ	xyz(5.2551, 4.8154, 17.4787)
Luminance	0.0482 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#183D75 #755018

analogous

#186B75 #183D75 #221875

triadic

#183D75 #75183D #3D7518

tetradic

#183D75 #75186B #755018 #187522

square

#183D75 #75186B #755018 #187522

split-complementary

#183D75 #752218 #6B7518

monochromatic

#050D19 #0E2342 #183D75 #2257A8 #3273D5

Accessibility & contrast

On white

10.70

#183D75 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.96

#183D75 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #183D75

10.70:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##183D75	#FFFFFF	#000000	##FFFFFF
##183D75	1.00	10.70	1.96	10.70
#FFFFFF	10.70	1.00	21.00	1.00
#000000	1.96	21.00	1.00	21.00
##FFFFFF	10.70	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#1F4377

Deuteranopia (green-blind)

#0A3A74

Tritanopia (blue-blind)

#004A53

Achromatopsia (no color)

#3E3E3E

Design tokens & code

CSS

--color: #183d75;
/* rgb */ color: rgb(24, 61, 117);
/* oklch */ color: oklch(36.6% 0.105 258.7);

Tailwind

colors: {
  custom: {
    50: '#64729d',
    500: '#183d75',
    950: '#000000',
  },
}

SCSS

$custom: #183d75;
$custom-light: #64729d;
$custom-dark: #000000;

JSON

{
  "hex": "#183d75",
  "rgb": {
    "r": 24,
    "g": 61,
    "b": 117
  },
  "hsl": {
    "h": 216.129,
    "s": 65.957,
    "l": 27.647
  },
  "oklch": {
    "l": 0.36642,
    "c": 0.10509,
    "h": 258.7
  },
  "luminance": 0.04816
}

Semantic roles & 50–950 ramp

primary

#183D75

secondary

#AA7F3F

accent

#A53FE9

background

#F6F6F9

surface

#EBECF2

border

#C6C7CC

text

#06070E

muted

#7A7A7E

Preview Lab

Preview with #183D75

Body copy rendered with the generated semantic roles for this colour.

Preview Lab → · Contrast checker → · Palette generator →